Fleece Performance Coolant Bypass Kit With Stainless Steel Line For 98.5-02 5.9L Cummins steering Engineered to clear 37-inch tires

Engineered to clear 37-inch tires while maintaining drivability and comfort

Clears up to 35-inch tires with minor trimming required

and proper suspension geometry

No hassles

Fleece Performance Coolant Bypass Kit With Stainless Steel Line For 98.5-02 5.9L Cummins steering Engineered to clear 37-inch tiresThe rear cylinders on the 5. 9 6. 7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures. This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure. Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on